A sodium vapor lamp is a gas discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
What does a high pressure sodium bulb look like.
If the tube is black the bulb is definitely burned out.
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A 400w bulb can easily cover a gardening area of approximately 15 square feet while a 1000w bulb can be used on a growing area of around 7x7 feet.
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The first course of action is to simply change the bulb.
The most common problem with a high pressure sodium light is the bulb.
Observe the interior gas tube for any signs of discoloration.
Two varieties of such lamps exist.
Low pressure and high pressure low pressure sodium lamps are highly efficient electrical light sources but their yellow light restricts applications to outdoor lighting such as street lamps where they are widely used.
Check the porcelain holder for any signs of deep cracks or breaks.
The arc tube has a high pressure inside for higher efficiency.
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Sodium mercury and xenon are usually used inside the arc tube.